この問題を提起したのは米国のタンプリン(A.R.Tamplin)及びコクラン(T.B.Cochran)である(1974年)。 (中略) この説はその後世界的に行われた調査研究により否定された。 (中略) ICRPの1977年勧告で記しているその理由は次のようである。 (1)大線量は細胞の再生能力の喪失あるいは細胞の死をもたらし、確率的影響では一定量の放射線エネルギーの吸収は均等分布によるものよりホットスポットによるものの方が効果が小さい。非確率的影響(確定的影響)でも中程度の線量で起こるかもしれない細胞喪失の量ではそれらの細胞が作る器官の機能喪失に恐らく至らない。 (2)疫学的調査で実際に限度(最大許容肺負荷量)以上に被ばくした複数の人について放射線誘発性の肺ガンが報告されていない。 ----- I myself don't think this possibility is completely denied. But you should keep in mind at least above (from the viewpoint of the mechanisms of biological effects of radiation). (2005/01/18 06:30:52 PM)
>Almost all researches subscribed in authorized journals are done scientifically not politically.
I'm sorry. I made mistake; "subscribe" -> "submit"
(1)恐らく至らない
Scientists tend to avoid categorical statements. The expression above means it is expectable from known data. As I said previously, you should think from the viewpoint of the mechanisms of biological effects of radiation, before you suspect a conspiracy. It is a scientific statement, not a conspiracy theory.
(2)報告されていない
I cannot understand what you want to say. As I already mentioned, I myself think further researches would be needed concerning the possibility of lung cancer incidnece by radiation from small particles. But I accept as scientific data at present.
Just for reference. Have you ever searched scientific journal data base? There are many reports from research institute of U.S. Department of Defense (probably) which suggest harmful effects of DU as radioacitivity. How do you about this? (2005/01/19 07:16:57 AM)
Before 1980s it was accepted as common sense that radiation would be harmful even in low dose. It seems strange for me that governments would have to give pressure in those days. Do you have any reliable source?
>LNT説から割り出した安全だとするガイドライン -----
Do you know the meaning of "LNT"? LNT is an abbreviation of Linear Non-threshold theory. It includes "Non-threshold."
It is a hypothesis for radiation protection.
The theory says that radiation is harmful depending on the amount even in low dose. The word "harm" means cancer in this context, not deterministic effects. You should not mix up stochastic effects and deterministic effects. It have been proved that there are thresholds concerning deternministcic effects.
Re[1]:続き 1 du@docozoさん In other words, it means that radiation have the potential to cause cancer in proportion to the dose of radiation, even in low dose. As Mr. meso said repeatedly, like: >『LNT説にたてば、確実に害はあるわけです。
But I must say that this theory is a <B>HYPOTHESIS for radiation protection</B>.
Normaly "従来の放射生物学は、高レベル被爆だけ実験して、その結果から低レベルの被爆を推量していた" means "so, the biological protective mechanisms (such as repair, apoptosis, immune system, and so on) have not been considered yet and the risk in low dose area would be over estimated."
But it is still uncertain , so for safety's sake, LNT is still assumed as being appliable in low dose area for the purpose of radiation protection.
This is LNT theory. (2005/01/19 07:01 PM) (2005/01/19 09:39:09 PM)
science du@docozoさん And I must say that scientific theories must not be changed by a single report.
The report must be criticized scientifically. The experiment must be reproducible by other researchers. The theory must be consistent with other related theories.
In so far as I searched roughly, Dr. Petkau dealed only a model system of biomembranes. Dr. Sternglass's theory seems to be regarded as only a hypothesis.
You might say this site is nuclear power side. But it is written about science.
Now there are a lot of reports concerning low dose effects. Some say it would be more harmful than expected from the caluclation of ICRP. But they are not ignored. On the contrary, biological effects of low dose radiation is hot theme now.
There would be other reasons if some reports might appear to be igonored. (2005/01/19 07:28 PM) (2005/01/19 09:39:43 PM)